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单词 focal length
释义  ˈfocal length noun [countable] technical  the distance between the centre of a lens and the focal point 焦距Examples from the Corpusfocal length• Properties of a parabola All parabolas are similar. Focal length a determines the magnitude.• A single focal length, fixed-focus is often sufficient.• The image produced by a diverging lens is however frequently virtual and consequently the focal length does not seem easy to determine.ˈfocal length nounChineseSyllable  centre a the between distance the of Corpus
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更新时间：2026/7/13 4:54:39